The chief cornerstone and the game plan
It is clear that Jesus carefully planned the first part of the Triumphal Entry. He chose a village where he had friends. One of those friends was alerted to ready a colt and tie it in front of the house at a specified time. Its owner was waiting and watching. The disciples were told where to find the colt and both parties memorized passwords.
It is also clear that Jesus engaged in similar planning for the Last Supper. A man who could recognize the disciples was waiting with a water pot to lead them to a house where the owner had already offered his large, furnished upper room to Jesus. Those involved used passwords again. Meticulous planning clearly surfaces in both of these occasions during holy week. I would suggest a third: the Triumphal Entry itself.